I really do hope that it requires both the 3 seals and the key item for every AF weapon so people will specialize more into their job of choice instead of everyone having everything. Again. It's certainly possible to get everything still but I don't think everyone will be willing to get 175,000 seals just for all the AF weapons. AF Armor was a lot easier since it was just questlines, these actually take a bit of work.
And I'm very happy that they do take a bit of work. Granted it's not that much work (if the level 2 bosses drop the items that is, not sure how hard level 5 bosses would be), but still enough that it looks like it'll be a small accomplishment that for once DIDN'T depend entirely on luck to obtain.
Also I'm going to be really really sad if the WHM AF weapon has nuking stats on it.
